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Loan Receivable - Summary of Information for Loan Receivable (Parenthetical) (Detail) | Dec. 31, 2018 | Dec. 31, 2017
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Evergreen Medicinal Supply Inc. [member] |  |
Disclosure of loan receivable [line items] |  |
Interest rate | 8.00% | 8.00%

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- Definition Disclosure of loans receivable [Line Items] + References No definition available. + Details
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Namespace Prefix: | cron_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Loan interest rate. + References No definition available. + Details
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Namespace Prefix: | cron_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |